Cavum

{
  "id": "MLC-T-MET-004209",
  "term": "Cavum",
  "field": "Meteorology and atmospheric science",
  "definition": "A supplementary cloud feature characterized by a well-defined, often circular or elliptical, hole or void appearing in a cloud layer. It forms when ice crystals fall from a supercooled liquid water cloud, initiating a glaciating process that clears a path through the cloud. This phenomenon is also known as a fallstreak hole or hole punch cloud.",
  "url": "https://mlchart.com/terminology/meteorology/cavum/"
}